public interface IShape {
/*    int a = 10;
    public int b = 20;
    private int c = 30;
    public static final int d = 40;*/

/*    public void test(){
        System.out.println("========");
    }

    default public void Hello(){
        System.out.println("========");
    }*/

    public abstract void World();
    void DrawOut();
}
